package designmode;


public class FalseSharing implements Runnable {

    public final static int NUM_THREADS = 2;
    public final static long ITERATIONS = 500L * 1000L * 1000L;
    private final int arrayIndex;

    private static VolatileLong[] longs = new VolatileLong[NUM_THREADS];

    static{
         for(int i = 0;i<longs.length;i++ ) {
             longs[i] = new VolatileLong();
         }
    }

    public FalseSharing(final int arrayIndex) {
        this.arrayIndex = arrayIndex;
    }

    public static void main(String[] args) throws Exception {
        final long start = System.currentTimeMillis();
        runTest();
        System.out.println("duration = " + (System.currentTimeMillis() - start));
    }
    private static void runTest() throws InterruptedException {
        Thread[] threads = new Thread[NUM_THREADS];
        for(int i = 0; i< threads.length;i++) {
            threads[i] = new Thread(new FalseSharing(i));
        }
        for (Thread t : threads) {
            t.start();
        }
        for (Thread t : threads) {
            t.join();
        }
    }
    @Override
    public void run() {
        long i = ITERATIONS + 1;
        while (0 != --i) {
            longs[arrayIndex].value = i;
        }
    }

    public final static class VolatileLong{
        public volatile  long value = 0L;
        public long p1 , p2 , p3 , p4 , p5 , p6 , p7;
    }
}
